Be hygienic. Wash your hands thoroughly after coming into contact with a sick person, using the bathroom, or anything else that could make you sick. (If you’re not sure what “thoroughly” entails, sing Happy Birthday to You in your head as you scrub--when you are done singing the song, you should finish washing your hands.) In addition to flossing regularly, brush your teeth and tongue at least twice daily to limit plaque and harmful bacteria. Take showers regularly. Schedule doctor’s and dentist’s appointments to make sure everything in your body is working properly and you are as healthy as you can be.